There are `n` married couples at a party. Each person shakes hand with every person other than her or his spouse. Find the total m of hand shakes.

There are "n" married couples at a path each person shakes hand with every person other than her or his spouse then number of handshakes is f(n), (sum_(n=4)^(oo) 1/(f(n)))^(-1) =?

In a party, there are 10 married couples. Each person shakes hands with every person other than her or his spouse. The total number of handshakes exchanged in that party is ___

Thirty members attended a party. If each person shakes hands with every other person exactly once. Then find the number of handshakes made in the party.

In a party there are 20 persons. If every person shook hand with every other person in the party exactly once, find the total number of handshakes exchanged in the party.

In a party, every person shakes his hand with every other person only once. If total number of handshakes is 210, then find the number of persons.

In a function there are 10 men and 8 women. Each man shakes his hand with all the men and each women shakes her hands with all the women. Find the total number of handshakes ?